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Finding a 20% tip
All you have to do is divide your check amount by five. For example, if your check comes to $85, divide that by five and your 20% tip will be $17.
Multiply two-digit numbers by 11
Simply add the two digits together and place the sum in the middle. For example, multiplying 25 by 11, add the two and place it between two numbers, which is 275.
Multiply by nine
Simply multiply the number by 10 first, then subtract the original number. For example, if you need to multiply nine by 23, multiply 23 by 10 to find 230.
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